EP3049336A1

EP3049336A1 - Tray made from cardboard sheet material, blank, device and method for producing such a tray

Info

Publication number: EP3049336A1
Application number: EP14793224.8A
Authority: EP
Inventors: Nicolas Lelay; Guillaume PIERAS
Original assignee: Otor SA
Current assignee: DS Smith Packaging France SAS
Priority date: 2013-09-27
Filing date: 2014-09-26
Publication date: 2016-08-03
Anticipated expiration: 2034-09-26
Also published as: FR3011228A1; KR20160061341A; PH12016500457B1; WO2015044606A1; KR102236085B1; PH12016500457A1; FR3011228B1; JP2016531808A; US20160236810A1; EP3049336B1; JP6692292B2; US10329045B2; ZA201601615B; TN2016000085A1

Abstract

The present invention concerns a tray (1) made from cardboard sheet material comprising a rectangular bottom (3) and a ring (4) of side walls, i.e. two first opposing side walls (5, 6), referred to as first walls, at least one of the first walls (5) being connected on either side by first fold lines (9) to end flaps (10, 11) referred to as first flaps, which may or may not themselves be connected respectively at the top part of same to a second flap (14) by a second fold line (15), and two second opposing side walls (7, 8), referred to as second walls. The second walls (7, 8) each comprise a rectangular central panel (20) of which the length l1 is less than the length l2 of the bottom, the panel (20) being connected, at each of the lateral ends of same, by a third fold line (21) to a reinforcing member forming a pillar (22) folded and glued to the central panel (20), and/or to the first flap of the adjacent first wall, i.e. a first reinforcing element located entirely separated from the adjacent first wall, and a second reinforcing element.

Description

The present invention relates to a plate made of cardboard sheet material having a rectangular bottom and a sidewall belt reinforced by pillars formed by folding. part of the walls.

It also relates to a blank for the production of such a tray, and a device and a corresponding method.

It finds a particularly important application although not exclusive in the field of storage trays and transport of packaged products of any type (rigid or flexible) whose use is not limited to transport (requiring good rigidity and good compressive strength) but is also suitable for storing and presenting products in departments.

Such trays are flexible and thus allow a mix making them suitable for the delivery and / or the simultaneous promotion of several different products.

In the case where they are used with a lid, they are of easy opening. When opened on the side, they allow products to be visible by making them also directly accessible to consumers.

Already known (FR 2 747 643) corrugated board trays provided with corner pillars obtained by folding end flaps.

Such trays, if they have good compressive strength, do not allow a presentation of the products on the sides. Also known (EP 2 036 827) are modular trays provided with support elements connectable to the top plate by the kiss of lateral pillars obtained by folding.

Such packages require the presence of connecting rods and are therefore complicated to implement.

The present invention aims to provide a tray, a blank made of cardboard sheet material, a device and a method for producing such a tray, better than those previously known to the requirements of the practice, in particular in that it proposes a tray allowing a use adapted to all the sizes of products, a homogeneous presentation in linear, in PLV or on pallet, in that it optimizes the space of sale, in that it facilitates the access to the products while allowing an excellent identification of the brand and this with a possibility of automatic manufacture at high speed (more than thirty shots / minute).

With the invention, the costs of multiple packaging are also reduced, because of the modular nature of the trays that are storable for different products on the same pallet.

In the same way, an optimized resistance / surface / weight ratio is obtained, and this with a cardboard, which can be entirely recycled which reduces the C02 emissions.

Finally, such a tray makes it possible to limit the number of movements for placing in the linear, eliminating the need for a cutter and / or pre-cut when placing on the shelf.

For this purpose, the invention notably proposes a sheetboard material tray having a rectangular bottom and a sidewall belt, namely two first opposite side walls, said first walls, at least one of said first walls being connected on either side by first fold lines to end flaps, said first flaps, themselves respectively connected or not in upper part to a second flap by a second fold line, and two second opposite side walls, said second walls, characterized in that the second walls each comprise a central rectangular panel of length less than the length of the bottom, said panel being connected at each of its lateral ends by a third fold line to a pillar reinforcing element folded and glued on said central panel, and / or on the first flap of the first adjacent wall, namely a first reinforcing element located entirely at distance from said first adjacent wall, and a second reinforcing member.

In advantageous embodiments, in addition and / or otherwise one or more of the following provisions are used:

the first reinforcing element is formed by a vertical tongue glued to the inner or outer face of the corresponding second wall;

- The first reinforcing element is formed by two tongues interconnected by fourth fold lines, folded and glued to one another at 180 °;

the first reinforcing element is formed by three rectangular vertical tongues interconnected by fourth fold lines, the first two tongues forming the said triangular cross-section pillar and the third end tongue being glued on the inner face; of the corresponding second wall or on the first flap of the first adjacent wall;

the first reinforcing element is formed by four rectangular vertical tongues interconnected by fourth fold lines, the first two or three tongues forming said pillar of triangular, rectangular or trapezoidal cross-section and the fourth end tongue being glued; on the inner face of the corresponding second wall or on the first flap of the first adjacent wall;

- The end tongue comprises an end protruding tenon relative to the height of the second wall, the bottom of the plate comprising recesses of complementary shape and arranged in line with said tenons, for embedding the tenons of the lower tray;

the central panel of each of the second walls is off-center with respect to the central axis of the plate perpendicular to said second walls;

one of the lateral ends of each second wall central panel is adjacent to the same first wall to form a corner pillar with the corresponding reinforcing element, the other end of said panel being located at an intermediate level of said second wall for forming an intermediate pillar with the other of its reinforcing elements;

- The reinforcing elements are symmetrical with respect to the central axis of the panel perpendicular to the second walls, to form intermediate pillars;

at least one of the first walls comprises in the upper part a third flap connected to said first wall by a fifth fold line, double, said third flap being folded towards the inside of the plate on the inner face of said first corresponding wall;

each of the first walls comprises a third flap;

the first wall or walls provided with third flaps are of smaller height than the second walls, the first end flaps having a trapezoidal or partially trapezoidal shape and being connected to the corresponding second flaps by sixth, double oblique fold lines; relation to the fifth fold line;

- The first flaps further comprise fourth flaps respectively connected to said first flaps by seventh fold lines, and located on the opposite side to the second flap, relative to the first flap;

the fourth flaps are of trapezoidal shape, are glued on the outer face of the bottom of the plate and are arranged to coincide at least in part with the upper periphery of one side of the abutment pillar below.

The invention also provides a blank for obtaining a tray as described above.

The invention also proposes a blank, for the constitution of a tray, comprising a rectangular bottom connected by junction lines with four rectangular flaps adapted to form the walls of the tray, namely two first opposed flaps, at least one of said first flaps being connected on both sides by first fold lines to end flaps, said first flaps themselves connected on their periphery, the opposite side to that located in the extension of the corresponding junction line of the first flap, with two second flaps by second fold lines, and two opposite second side flaps, characterized in that the second flaps each comprise a rectangular central panel of length less than the length of the bottom, said panel being connected to each from its lateral ends by a third fold line to an element capable of forming a pillar during the formation of the plate.

In an advantageous embodiment, the element capable of forming a pillar is formed by two, three or four rectangular tabs, interconnected by fourth fold lines, the first tabs being adapted to form the pillar and the last tab of FIG. end being adapted to be glued on the inner face of the second corresponding wall.

Advantageously, the blank is characterized in that at least one of the first flaps comprises at the outer periphery a third flap connected to said first flap by a fifth folding line, double, said third flap being arranged to be folded inwards when the tray is formed on the inner face of said first corresponding flap.

The invention also provides a method and a device for forming a tray as described above.

The invention also proposes a method of forming a tray from a blank comprising a rectangular bottom connected by junction lines with four rectangular flaps suitable for forming the walls of the tray, namely two opposite first flaps, at least one of said first components being connected on both sides by first lines of folding end flaps, said first flaps themselves connected on their periphery, the opposite side to that located in the extension of the corresponding junction line of the first flap, two flaps by second fold lines, and two seconds opposite side flaps, characterized in that the second flaps each comprise a rectangular central panel of length less than the length of the bottom, said panel being connected at each of its lateral ends by a third fold line to a reinforcing element provided with a junction face with the second lateral flap,

the blank is stripped from a vertical stack of flat blanks,

the blank is transferred to a first volume-setting station of said reinforcing elements while gluing said junction faces of said reinforcing elements during the transfer,

counterpressure pieces are brought in line with the third fold lines above the blank,

said counter-pressure parts, said reinforcing elements on the opposite side to said junction face, are pressurized with corresponding formers, of shape complementary to the shape of the reinforcements placed in volume to form pillars by folding,

we erase the counterpressure parts and the conformers,

the blank is transferred with the reinforcement elements placed in volume by gluing the first and second flaps to a final forming station,

forming the plate at said final forming station by raising a cavity or piston by a mandrel vertical in a cavity, and eject the tray thus formed.

Advantageously, the reinforcing element capable of forming a pillar is formed by three or four rectangular blades, interconnected by junction lines, the first two or three first blades being arranged to form said pillar, of triangular or polygonal cross-section and the third or fourth end blade, being adapted to stick the end tongue on the inner face of the second wall of the corresponding formed plate.

The invention also proposes a device for implementing the above method and / or for producing a plate as described above.

The invention will be better understood on reading the following description of embodiments given hereinafter by way of non-limiting examples. The description refers to the accompanying drawings in which:

Figure 1 is a perspective view of a tray according to a first embodiment of the invention.

FIG. 2 is a plan view of the blank making it possible to obtain the plate of FIG. 1.

Figure 3 is a perspective view of a partial stack of two trays according to a second embodiment of the invention, with centralizers.

FIG. 4 is a plan view of the blank making it possible to obtain a plate of FIG.

Figures 5 and 6 are respectively perspective views of a tray according to a third embodiment and flat blank to obtain such a tray.

FIGS. 7 and 8 are perspective views of a fourth embodiment of trays according to the invention (Figure 7) and the blank for obtaining such trays.

Figures 9, 10 on the one hand and 11, 12 on the other hand respectively show trays and blanks for fifth and sixth embodiments of the invention, with first walls and second walls of equal heights.

FIG. 13 shows a stack of trays nested one on the other, according to the embodiment of FIG. 1.

FIGS. 14A and 14B are respectively a plan view of a blank, and in perspective of the plate obtained with such a blank, according to another embodiment of the invention.

Figure 14C is a schematic sectional view of an intermediate pillar of the tray of Figure 14B.

Figures 14D and 14E are schematic sectional views of other embodiments of intermediate pillars for the tray according to the invention, a tab.

Figs. 15A-15D are cross-sectional views of intermediate pillars, according to other embodiments of the invention with two tabs.

FIGS. 16A to 16F, and 17A to 17C are cross-sectional views, respectively, of intermediate pillars with three tabs, respectively four tabs according to other embodiments of the invention.

FIGS. 18A to 18C show schematic perspective views illustrating an embodiment of a device according to the invention as well as the steps implemented by the corresponding method.

FIGS. 1 and 2 show respectively a plate 1 and a blank 2 made of corrugated sheet, for example of three millimeters thick, having a rectangular bottom 3 and a belt 4 of side walls or shutters namely two first walls or opposite flaps 5.6 and two second walls or opposite flaps 7.8.

The first wall 5 is rectangular and connected on both sides by first fold lines 9 to end flaps 10, 11 rectangular or substantially rectangular (for example trapezoidal or partially trapezoidal with an angle to the base between 5 ° and 45 °), symmetrical with respect to the longitudinal axis 12 of the blank 2.

The end flaps 10, 11 are themselves connected in the upper part, that is to say on the outer periphery 12 parallel and / or in the extension of the upper periphery 13 of the first flap 5, to second flaps 14, via double fold lines 15 obliquely towards the axis 12 and the center of the panel 3, for example with an angle α with respect to the axis between 80 ° and 45 ° for example 70 °.

The width L1 of the flaps 10 and 11, and that L2 of the second flaps are such that there is partial overlap of the second flap 7 facing, when the flaps are folded to form the plate (Cf Figure 1). By playing on the widths L1 and 12 (L1 <L2), as well as on the dimensions of the reinforcing elements forming in the embodiment of the accordion pillars which will be described hereinafter, a drawer / display 16 is thus produced. width L2 plus or minus important

The first wall or first flap 5 further comprises in the upper peripheral portion 13 a third rectangular flap 17 connected to the first wall by a fifth fold line 18, double, that is to say thick enough to allow the folding of the third flap 17 on the inner face 19 of the first wall.

The flap 5 is of height hl and the flap 6 of height h2> hl, but smaller than the height H of the second flaps, which will now be described.

The plate further includes two second flaps or walls 7 and 8, each having a central rectangular panel 20 of height H, of length 11 less than the length 12 of the bottom, for example between 1/2 and 4/5 of said length 12, for example equal to 3/4.

Each central panel 20 is connected at each of its ends, via a third fold line 21, to a member 22 accordion forming pillar, folded and glued to the inner face 23 of the central panel.

More specifically, and in the embodiment more particularly described here, each accordion element is formed by three vertical tongues parallel to the third fold line 21, namely a first and a second tongues 24, 25 and 26, 27, rectangular identical two by two, respectively interconnected by fold lines 28 or 29, and a third tongue 30, 31 substantially rectangular of smaller length (comprising a notch in the lower part), adapted to be glued, or glued when the plateau is formed on the corresponding inner face 23.

Each of the third tongues 30, 31 comprises in the upper part an end 32 forming a pin, for example of trapezoidal shape, protruding from the periphery of the second flap and / or the height H of the second wall, and a corresponding notch in the lower part.

The bottom 3 of the plate comprises recesses 33 (slots) of complementary shape to the tenons of the bottom tray, which are found at the right in case of stacking one on the other. More precisely, the slots are rectangular of the thickness or a little more than the thickness of the corrugated cardboard, and have a side confused at the junction line 34 between the bottom 3 and the second flaps 7 and 8.

In the embodiment of Figures 1 and 2, the central panels 7 and 8 are eccentric with respect to the transverse central axis 35 of the plate perpendicular to the second walls, one end of the panels (fold line 21) being adjacent to the same first wall 6 here consisting of a rectangular or substantially rectangular panel devoid of flaps, to form a corner pillar with the corresponding accordion element 22.

The fold line 21 is therefore, when the blank is flat, in the extension of the junction line 36 between the first flap 6 and the bottom 3.

The other pillar 22, associated with the same panel, is in turn disposed at the other end in an intermediate manner relative to the wall and serves as an external support point for the part 16 forming a cantilever or cantilever relative to the bottom shelf.

In the remainder of the description, the same reference numbers will preferably be used to designate the same elements or similar elements.

Figures 3 and 4 show trays 37 and a blank 38 which differ from the tray and blank described above, that in that the first are provided, in addition, fourth flaps 39, trapezoidal, respectively connected to the first flaps by seventh fold lines 40, and located on the opposite side to the second flap 14, relative to the first flap.

The fourth flaps are folded on the outer face 41 of the bottom 3 of the plate on which they are glued, to form centrers arranged to coincide with a side 42 at the top of the pillar 22 of the tray below.

The fourth flaps 39 further consolidate the corbelled portion 16 which is all the more solid.

Figures 5 and 6 show a variant of plate 43 and blank 44 to achieve it, very similar to the tray and blank of Figures 1 and 2, but having a configuration of pillars 22 symmetrical with respect to the transverse axis 35 of the plate leaving two openings because hl <H.

FIGS. 7 and 8 are an embodiment of plate 45 and blank 46 comprising on the one hand third flaps 17 on each of the first flaps 5-6, and on the other hand fourth flaps 39 trapezoidal to form polarizers and / or reinforcements as described with reference to Figures 3 and 4.

Figures 9 and 10 show a plate 47 provided with four walls 48, 49 of the same height, namely two identical first walls or flaps 48 and two second walls or identical flaps 49.

The first identical rectangular flaps 48 are provided with two first end flaps 50, symmetrical with respect to the longitudinal axis 12 of the plate. Each first flap 50 is provided with a second flap 51 attached by a fold line 52 of the outer peripheral side opposite the side of the first flap arranged to come into coincidence with the junction line 34 with the second flaps 49, and a fifth flap hook 53, adapted to fold and be glued to the outer face 54 of the first flaps 48 corresponding.

Figures 11 and 12 show a variant of Figures 9 and 10, the trays 55 being here provided with four pillars 22 and four flaps 48 and 49, of the same height, with a fourth hook flap 53.

They further comprise fifth flaps 56 in the form of isosceles trapezium, attached by fold lines 57 and adapted to be bonded to the outer face 58 of the bottom of the tray.

The angle β of the hook between its oblique periphery 59 and the end 60 of the first flap on which is fixed the second flap 51, and the angle γ of the oblique wall of the triangle 61 formed by the pillar of triangular cross-section with the inner wall of the flap 49, are complementary to the shape of the trapezium of the fifth flap, so that there is embedding of this flap between the two elements formed by the fifth flap 53 hook once glued, and the top of the pillar 22.

Thus is constituted a complementary centering element.

FIG. 13 shows a stack 60 of plate 1 according to the embodiment described with reference to FIG.

The pillars 22 superimposed on each other in a controlled manner thanks to the centering elements take up the compressive forces while leaving a cantilever 16 for accessing and / or viewing the elements contained in the trays.

We will now describe the manufacture of a tray 1 and a stack 60 according to an embodiment of the invention with reference to Figures 1, 2 and 13.

From a flat blank, the pillars are formed by folding elements 22 accordion (after gluing the inner face of the third end tab 30).

Then the flaps 7 and 8 are straightened and the lateral ends of the first flap 6, are glued and plated on the outer face of the tongue 21, the latter being arranged with the rest of the pillar element, to be perpendicular to the flaps 8, 7 during forming.

The first flap 5 is itself formed by folding the flaps 14 of form arranged to fit well between the pillar on one side and the first wall of the other. It is then expected a collage of his last on the inner face of the corresponding first flap, the third flap itself being folded and / or glued on the inner face of the corresponding flap 5, then the whole is folded and the ends devoid of the flaps 10, 11 glued on the outer face of the second adjacent flap 7, 8 to thus constitute the trays which will then be stacked to form a palletizable system, multimodular high strength as shown in Figure 13.

FIGS. 14A, 14B and 14C show another embodiment of a plate 70 and / or its constituent elements, comprising a rectangular bottom 3 and first walls 71 and 72. The first wall 71 is entirely perforated at its center and formed by two end portions 73 in the shape of an arc of a circle or a curve, (the remainder of the wall being thus completely hollowed out) and comprises the end flaps 74 connected to each other. at the end portions curved by the first fold lines 75.

The other first wall 72 is simply rectangular without flap. The plate also comprises two identical second walls 76, 77, symmetrical with respect to the longitudinal axis 78 of the plate, the length JL i of said panel being lower than that of the bottom 1 ^. Each wall or panel 76, 77 comprises on one side a reinforcing member 79 formed by a rectangular flap connected to the panel by a double fold line 80 located at a distance 1 _¾ - _L. of the fold line of the bottom with the first flap 71.

It comprises on the other side a reinforcing element 81 of the type described with reference to FIG. 2, namely a first tongue 24 connected to the panel by a fold line 21, a second tongue 25 connected to the first tongue by a line 28, for example here a double fold line, and a third tongue 30, all of these three tongues for the formation of a corner pillar 83 of triangular section.

Ends 32 on the end flaps will allow centering in the recesses 33 as described above, notches being provided in the lower part of the flaps 79, to escape the recesses 33 opposite and allow embedding (as in Figure 2).

FIG. 14C shows in section the reinforcement 84 obtained with the flap 79 folded at 180 ° and glued to the internal face of the shutter 76. The length p of the flap 74 is dimensioned, ie it is of sufficient length to allow it to stick face to face on the external face of the wall 76, for example over a distance greater than the width of the tongues 79.

FIGS. 14D and 14E show two other embodiments 85 and 86 of one-sided pillar 87 and 88, which are fixed by gluing on the external face of the panel 76 and on the internal face of the flap 74 (FIG. 14D), is fixed on the inner face of the panel 76 and on the outer face of the flap 74 (Figure 14E).

FIGS. 15A to 15D are diagrammatic cross-sectional views of intermediate reinforcement 87, 88, 89, 90 with two tabs 91, 92 respectively folded at 180 ° and glued to one another and to the internal face of the flap 74 , itself fixed by gluing on the outer face of the panel 76 (FIG. 15A) or not (FIG. 15B).

FIGS. 15C and 15D show a first tongue 91 bent at 180 ° with respect to the panel 76, the second tongue 92 being sandwiched with respect to the internal face of the panel 76 and said first tongue, with the inside face of the flap 74 glued on wall 76 (FIG. 15C) or on the outer face of first tab 91 (FIG. 15D).

In the latter two cases, the line of junction between the two tongues is a double fold line to allow the reversal.

FIGS. 16A and 16F show six embodiments of intermediate pillars with three tongues allowing the formation of various triangular section pillars, in accordion with the first five modes 91, 92, 93, 94, 95. Here the tabs 96, 97, 98 are such that the first tongue 96 is folded towards the inside of the wall 76 at a more or less acute angle, the second tab being longer or shorter (relative to the length of the first one). tab) to form an equilateral triangle (Figure 16A), rectangle on the first tongue (Figure 16B) isosceles (Figure 16C), rectangle on the second tab (Figure 16D) or any (Figure 16E).

In these five embodiments, the third tongue 98 is bonded to the inner face of the wall 76.

The sixth embodiment 99 is that of Figure 16F.

Here the first tongue 96 is folded outwards, the third tongue 98 being stuck on the inner face of the flap 74.

In all cases, the latter is of sufficient length to be glued on the outer face of the wall 76.

FIGS. 17A to 17C show the intermediate pillars 100, 101, 102 obtained with four tongues 103, 104, 105, 106.

FIG. 17A shows a pillar of square section, the last tab 106 being glued on the internal face of the panel 76.

FIG. 17B shows a first tongue folded at 180 °, glued on the internal face of the panel 76, the two following tabs forming a triangle, the last tongue being here still glued on the internal face of the panel 76.

Finally, FIG. 17C shows an embodiment equivalent to that of FIG. tabs, giving the pillar a configuration trapezoidal section.

FIGS. 18A to 18E show a device and a method for forming the plate 1 according to the embodiment of the invention more particularly described here.

From a magazine 107 for the flat storage of a stack 108 of blanks 109, these are grasped by suction means 110 known in themselves and transferred to a first station 111 for setting the volume of the elements reinforcement 22 while gluing (injector gun not shown) the junction faces of said reinforcing elements during the transfer.

Counterpressure pieces 112 above the third fold lines, at the blank, for example formed by parallelepipeds are also placed in contact with the blank, for example during the transfer.

Then pressurized (see Figure 18B) on said compression members, the reinforcing elements 22 on the opposite side to the junction face, with shapers 113 of complementary shape to the shape of the reinforcements set in volume to form the pillars corners and intermediate pillars.

After evacuation of the counter pressure parts and gripping means, the shapers 113 are cleared (see arrow 114 - FIG. 18C).

Then the blank is transferred with the reinforcing elements formed flat (step 115 - Figure 18A) by gluing the first and second flaps (not shown bonding means) to the final forming station 116 (Figure 18C).

The plate is then formed around a mandrel, for example by swaging in a cavity 117 with mandrel elements 118 having shapes complementary to the plate and its preformed pillars flat, then the tray 1 thus formed, 119 is evacuated (Figure 18C).

As goes without saying and as it follows moreover from what preceded the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants and especially those where the pillars are formed of more than four tabs having a polygonal section, those where the third flaps form sidewalks, those where the tray further comprises lids designed in a known manner in itself, and attached to the tray by bonding points easily tearable laterally by simple spacing.

Claims

A tray (1, 37, 43, 45, 47, 55, 70) made of cardboard sheet material having a rectangular bottom (3) and a side wall belt (4), namely two first side walls (5, 6, 48, 71, 72), said first walls, at least one of said first walls (5,48, 71) being connected on either side by first folding lines (9) to end flaps (10, 11, 50, 74), said first flaps, themselves respectively connected or not in the upper part to a second flap (14; 51) by a second fold line (15, 52), and two second side walls (7, 8, 49, 76, 77) opposite said second walls, characterized in that the second walls (7, 8, 49, 76, 77) each comprise a rectangular central panel (20, 49) 1_1 lower length at the length 1_2 of the bottom, said panel (20, 49) being connected at each of its lateral ends by a third fold line (21, 80) to a reinforcing element form an abutment (22, 83, 84) folded and adhered to said central panel (20), and / or on the first flap of the first adjacent wall, namely a first reinforcing member (84, 85, 86, 22, 91 , 92, 93, 94, 95, 99, 100, 101, 102) located entirely at a distance from said first adjacent wall, and a second reinforcing member (22, 83).

2. Tray according to claim 1, characterized in that the first reinforcing element (84, 85, 86) is formed by a vertical tongue (79, 87, 88) adhered to the inner or outer face of the second wall (76, 85, 86). ) corresponding.

3. Tray according to claim 1, characterized in that the first reinforcing element (87, 88, 89, 90) is formed by two tabs (91, 92) interconnected by fourth fold lines, folded and glued to each other at 180 °

4. Tray according to claim 1, characterized in that the first reinforcing element (22, 91, 92, 93, 94, 95, 99) is formed by three rectangular vertical tongues (26, 27, 31, 96, 97, 98), interconnected by fourth fold lines (28), the first two tongues forming said triangular cross-section pillar and the third end tongue (30, 31) being adhered to the inner face (23). of the corresponding second wall or on the inside of the flap (74) of the first wall ad acente

5. Tray according to claim 1, characterized in that the first reinforcing element (100, 101, 102) is formed by four rectangular vertical tongues (103, 104, 105, 106) interconnected by fourth fold lines. the first two or three tongues forming said pillar of triangular, rectangular or trapezoidal cross-section and the fourth end tongue being adhered to the inner face of the corresponding second wall or on the first flap of the first adjacent wall.

6. Tray according to any one of the preceding claims, characterized in that the end tongue comprises a stud end (32) protruding from the height of the second wall, the bottom (3) of the tray comprising recesses (33) of complementary shape and arranged at the right of said tenons, for embedding the tenons of the tray below.

7. Tray according to any one of the preceding claims, characterized in that the central panel (20) of each of the second walls (7, 8, 49) is off-center with respect to the central axis (35) of the plate perpendicular to said seconds walls.

8. Tray according to claim 7, characterized in that one of the lateral ends of each central panel (20) of second wall, is adjacent to the same first wall to form a corner pillar (22 ') with the corresponding reinforcing element, the other end of said panel being located at an intermediate level of said second wall to form an intermediate pillar (22) with the other of its reinforcing elements.

9. Tray according to any one of the claims

1 to 6, characterized in that the reinforcing elements are symmetrical with respect to the central axis (35) of panel perpendicular to the second walls, to form intermediate pillars.

10. Tray according to any one of the preceding claims, characterized in that at least one of the first walls (5, 6) comprises in the upper part (13) a third flap (17) connected to said first wall by a fifth line of folding (18), double, said third flap (17) being folded towards the inside of the plate on the inner face of said first corresponding wall.

11. Tray according to claim 10, characterized in that each of the first walls (5, 6) comprises a third flap (17).

12. Tray according to any one of claims 10 and 11, characterized in that the or the first walls (5, 6) provided with third flaps (17) are of smaller height than the second walls, the first end flaps (10, 11) having a trapezoidal shape and being connected to the corresponding second flaps by sixth double fold lines (15), oblique with respect to the fifth fold line (18).

13. Tray according to any one of the preceding claims, characterized in that the first flaps further comprise fourth flaps (39) respectively connected to said first flaps by seventh fold lines (40), and located on the opposite side to the second flap (14) relative to the first flap (10).

14. Tray according to claim 13, characterized in that the fourth flaps (39) are trapezoidal shaped, are glued on the outer face (41) of the bottom (3) of the tray and are arranged to coincide at least in part with one side of the pillar (22) of the tray below.

15. Flan (2, 38, 44, 46), for the constitution of a tray, having a rectangular bottom (3) connected by junction lines (34) with four rectangular flaps adapted to form the walls of the tray, to namely two opposite first flaps (4, 6, 48), at least one of said first flaps being connected on either side by first fold lines to end flaps, said first flaps (10, 11, 50) themselves connected on their periphery, on the opposite side to that situated in the extension of the corresponding junction line of the first flap, to two second flaps (14, 57) by second fold lines, and two second lateral flaps (7, 8, 49) opposite, characterized in that the second flaps each comprise a central rectangular panel of length less than the length of the bottom, said panel being connected to each of its lateral ends by a third fold line to an element suitable for forming a pillar during the formation of the plate.

16. blank according to claim 15, characterized in that the element capable of forming a pillar (22) is formed by two, three or four rectangular tabs (24, 25, 30, 26, 27, 31), connected between they by fourth fold lines, the first tongues being arranged to form said pillar, of triangular cross section and the last tab, end, being adapted to be glued on the inner face of the second corresponding wall.

17. blank according to any one of claims 15 and 16, characterized in that the last tab

(30, 31) comprises an end protruding tenon relative to the width of the second flap and in that the bottom of the plate comprises recesses of complementary shape arranged to be at the right of said tenons when the plate is formed, for embedding tenons of the plateau below.

18. Blank according to any one of claims 15 to 17, characterized in that the central panel (20) of each of the second flaps is off-center with respect to the central axis (35) of the blank perpendicular to said second flaps.

19. Blank according to claim 18, characterized in that one of the lateral ends of each central panel of second flap, is in the extension of the junction line (34) with a first flap, to form a pillar (22). angle with the corresponding element during the formation of the plate, the other end of said panel being located at an intermediate level of said second component to form a pillar intermediate (22) with the other of its elements when said tray is formed.

20. blank according to any one of claims 15 to 19, characterized in that the elements (22) are symmetrical with respect to the central axis of the blank perpendicular to the second flaps, to form pillars (22) intermediate when the plateau is formed .

21. Blank according to any one of claims 15 to 20, characterized in that at least one of the first flaps comprises at the outer periphery a third flap (17) connected to said first flap by a fifth fold line, double, said third flap being arranged to be folded inwards when the plate is formed, on the inner face of said first corresponding flap.

22. blank according to claim 21, characterized in that each of the first components comprises a third flap (17).

23. Blank according to any one of the claims

21 and 22, characterized in that the first flap or flaps with third flaps (17) are smaller in width than the second flaps (7, 8), the first end flaps (10, 11) having a trapezoidal shape. and being connected to the corresponding second flaps by sixth fold lines (15) double, oblique with respect to the fifth fold line (18).

24. blank according to claim 15 to 23, characterized in that the first flaps further comprise fourth flaps (39) respectively connected to said first flaps by seventh fold lines (40), and located on the opposite side to the second flap, compared to the first flap.

25. A method of forming a tray from a blank having a rectangular bottom connected by junction lines with four rectangular flaps adapted to form the walls of the tray, namely two opposite first flaps, at least one of said first flaps. being connected on both sides by first folding lines to end flaps, said first flaps themselves connected on their periphery, on the opposite side to that situated in line with the corresponding junction line of the first flap, with two flaps by second fold lines, and two opposite second side flaps, characterized in that the second flaps each comprising a central rectangular panel of length less than the length of the bottom, said panel being connected to each of its lateral ends by a third fold line to a reinforcing element provided with a junction face with the second lateral flap,

the blank is stripped from a vertical stack of flat blanks,

we erase the counterpressure parts and the conformers, the blank is transferred with the reinforcement elements placed in volume by gluing the first and second flaps to a final forming station,

the tray is formed at said final forming station by raising a cavity or piston by a vertical mandrel in a cavity, and the plate thus formed is ejected.

26. The method of claim 25, characterized in that the reinforcing element suitable for forming a pillar is formed by three or four rectangular blades interconnected by junction lines, the first two or three blades being arranged to form said pillar, of triangular or rectangular cross section and the last end plate, being adapted to stick the end tongue on the inner face of the second wall of the formed plate, corresponding.

27. A device for forming a tray from a blank having a rectangular bottom connected by junction lines with four rectangular flaps adapted to form the walls of the tray, namely two opposite first flaps, at least one of said first flaps. being connected on both sides by first fold lines to end flaps, said first flaps, said first flaps being themselves connected on their periphery, on the opposite side to that located in the extension of the junction line corresponding of the first flap, with two flaps by second fold lines, and two opposite second side flaps,

characterized in that the second flaps each comprise a central rectangular panel of length less than the length of the bottom, said panel being connected at each of its lateral ends by a third fold line to a reinforcing element provided with a junction face with the second lateral flap, it comprises

means for unstacking the blank from a vertical stack of flat blanks,

means for transferring the blank to a first station for setting the volume of said reinforcing elements,

sizing means of said junction faces of said reinforcing elements during the transfer, means for bringing counterpressure parts vertically above the third fold lines above the blank,

pressurizing means on said counterpressure pieces, said reinforcing elements on the opposite side to said junction face, comprising shapers complementary in shape to the reinforcements placed in volume to form pillars by folding,

means for removing the counter-pressure parts from the conformers,

means for transferring the blank with the reinforcement elements placed in volume towards a final forming station,

sizing means of the first and second flaps,

means for forming said plate at said final forming station comprising a vertically displaceable cavity or means for pressing a vertical mandrel in a cavity, and ejection means for said plate thus formed.

28. Device according to claim 27, characterized in that the reinforcing element suitable for forming a pillar is formed by three or four rectangular blades, interconnected by lines of junction, the first two or three blades being arranged to form said pillar, of triangular or rectangular cross section and the last end plate being adapted to stick the end tongue on the inner face of the second wall of the formed plate, corresponding.